springBoot整合ElasticSearch

1.依赖

ElasticSearch  7.16.0

JDK11 以上版本

     <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-elasticsearch</artifactId>
        </dependency>    

2.配置

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import org.apache.http.HttpHost; import org.elasticsearch.client.RestClient; import org.elasticsearch.client.RestHighLevelClient; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration;   @Configuration public class ElasticsearchClientConfig {       @Bean     public RestHighLevelClient restHighLevelClient() {         RestHighLevelClient client = new RestHighLevelClient(                 RestClient.builder(                         new HttpHost("127.0.0.1", 9200, "http")));         return client;     }   }

　　

3.工具类

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package com.example.es.utils;   import com.alibaba.fastjson.JSON; import org.elasticsearch.action.admin.indices.delete.DeleteIndexRequest; import org.elasticsearch.action.bulk.BulkRequest; import org.elasticsearch.action.bulk.BulkResponse; import org.elasticsearch.action.delete.DeleteRequest; import org.elasticsearch.action.delete.DeleteResponse; import org.elasticsearch.action.get.GetRequest; import org.elasticsearch.action.get.GetResponse; import org.elasticsearch.action.index.IndexRequest; import org.elasticsearch.action.index.IndexResponse; import org.elasticsearch.action.search.SearchRequest; import org.elasticsearch.action.search.SearchResponse; import org.elasticsearch.action.support.master.AcknowledgedResponse; import org.elasticsearch.action.update.UpdateRequest; import org.elasticsearch.action.update.UpdateResponse; import org.elasticsearch.client.RequestOptions; import org.elasticsearch.client.RestHighLevelClient; import org.elasticsearch.client.indices.CreateIndexRequest; import org.elasticsearch.client.indices.CreateIndexResponse; import org.elasticsearch.client.indices.GetIndexRequest; import org.elasticsearch.core.TimeValue; import org.elasticsearch.index.query.QueryBuilders; import org.elasticsearch.rest.RestStatus; import org.elasticsearch.search.builder.SearchSourceBuilder; import org.elasticsearch.search.fetch.subphase.FetchSourceContext; import org.elasticsearch.xcontent.XContentType; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.beans.factory.annotation.Qualifier; import org.springframework.stereotype.Component; import java.io.IOException; import java.util.List; import java.util.concurrent.TimeUnit;   @Component public class EsUtils<T>{       @Autowired     @Qualifier("restHighLevelClient")     private RestHighLevelClient client;     //*************************索引******************************************     /**      * 判断索引是否存在      * @param index      * @return      * @throws IOException      */     public boolean existsIndex(String index) throws IOException {         GetIndexRequest request = new GetIndexRequest(index);         boolean exists = client.indices().exists(request,                 RequestOptions.DEFAULT);         return exists;     }       /**      * 创建索引      * @param index      * @throws IOException      */     public boolean createIndex(String index) throws IOException {         CreateIndexRequest request = new CreateIndexRequest(index);         CreateIndexResponse createIndexResponse                 =client.indices().create(request,RequestOptions.DEFAULT);         return createIndexResponse.isAcknowledged();     }     /**      * 删除索引      * @param index      * @return      * @throws IOException      */     public boolean deleteIndex(String index) throws IOException {         DeleteIndexRequest deleteIndexRequest = new                 DeleteIndexRequest(index);         AcknowledgedResponse response =                 client.indices().delete(deleteIndexRequest, RequestOptions.DEFAULT);         return response.isAcknowledged();     }   //***********************记录 查询*********************************       /**      * 判断某索引下文档id是否存在      * @param index      * @param id      * @return      * @throws IOException      */     public boolean docExists(String index, String id) throws IOException {         GetRequest getRequest = new GetRequest(index,id);         //只判断索引是否存在不需要获取_source         getRequest.fetchSourceContext(new FetchSourceContext(false));         getRequest.storedFields("_none_");         boolean exists = client.exists(getRequest, RequestOptions.DEFAULT);         return exists;     }     /**      * 根据id来获取记录      * @param index      * @param id      * @return      * @throws IOException      */     public GetResponse  getDoc(String index, String id) throws IOException {         GetRequest getRequest = new GetRequest(index, id);         GetResponse getResponse = client.get(getRequest, RequestOptions.DEFAULT);         return getResponse;     }       /**      * 根据某字段来搜索      * @param index      * @param field      * @param key 要收搜的关键字      * @throws IOException      */     public void search(String index,String field ,String key,Integer             from,Integer size) throws IOException {         SearchRequest searchRequest = new SearchRequest(index);         SearchSourceBuilder sourceBuilder = new SearchSourceBuilder();         sourceBuilder.query(QueryBuilders.termQuery(field, key));         //控制搜素         sourceBuilder.from(from);         sourceBuilder.size(size);         //最大搜索时间。         sourceBuilder.timeout(new TimeValue(60, TimeUnit.SECONDS));         searchRequest.source(sourceBuilder);         SearchResponse searchResponse = client.search(searchRequest,                 RequestOptions.DEFAULT);         System.out.println(JSON.toJSONString(searchResponse.getHits()));     }         //***********************记录 添加修改删除*********************************     /**      * 添加文档记录      * @param index      * @param id      * @param t 要添加的数据实体类      * @return      * @throws IOException      */     public boolean addDoc(String index,String id,T t) throws IOException {         IndexRequest request = new IndexRequest(index);         request.id(id);         //timeout         request.timeout(TimeValue.timeValueSeconds(1));         request.timeout("1s");           request.source(JSON.toJSONString(t), XContentType.JSON);         IndexResponse indexResponse = client.index(request,                 RequestOptions.DEFAULT);         RestStatus Status = indexResponse.status();         return Status==RestStatus.OK||Status== RestStatus.CREATED;     }     /**      * 批量添加文档记录      * 没有设置id ES会自动生成一个，如果要设置 IndexRequest的对象.id()即可      * @param index      * @param list      * @return      * @throws IOException      */     public boolean bulkAdd(String index, List<T> list) throws IOException {         BulkRequest bulkRequest = new BulkRequest();         //timeout         bulkRequest.timeout(TimeValue.timeValueMinutes(2));         bulkRequest.timeout("2m");         for (int i =0;i<list.size();i++){             bulkRequest.add(new IndexRequest(index)                     .source(JSON.toJSONString(list.get(i))));         }         BulkResponse bulkResponse = client.bulk(bulkRequest,                 RequestOptions.DEFAULT);         return !bulkResponse.hasFailures();     }       /**      * 更新文档记录      * @param index      * @param id      * @param t      * @return      * @throws IOException      */     public boolean updateDoc(String index,String id,T t) throws IOException     {         UpdateRequest request = new UpdateRequest(index,id);         request.doc(JSON.toJSONString(t));         request.timeout(TimeValue.timeValueSeconds(1));         request.timeout("1s");         UpdateResponse updateResponse = client.update(                 request, RequestOptions.DEFAULT);         return updateResponse.status()==RestStatus.OK;     }     /**      * 删除文档记录      * @param index      * @param id      * @return      * @throws IOException      */     public boolean deleteDoc(String index,String id) throws IOException {         DeleteRequest request = new DeleteRequest(index,id);         //timeout         request.timeout(TimeValue.timeValueSeconds(1));         request.timeout("1s");         DeleteResponse deleteResponse = client.delete(                 request, RequestOptions.DEFAULT);         return deleteResponse.status()== RestStatus.OK;     } }

4.测试

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@SpringBootTest class SpringbootElasticSearchApplicationTests {       @Autowired     @Qualifier("restHighLevelClient")     private RestHighLevelClient client;     @Autowired     private  EsUtils esUtils;     @Test     void contextLoads() {         String index="test";         String id="10";         try {             boolean b = esUtils.existsIndex(index);             if(b){                 boolean b1 = esUtils.docExists(index, id);                 if(b1){                     GetResponse getResponse = esUtils.getDoc(index, id);                     //字符串编码格式转换  UTF-8转GBK                     String value = new String (getResponse.getSourceAsString().getBytes("UTF-8"),"GBK");                     System.out.println(value);                 }else{                     User user = new User("test", 20, "male");                     boolean flag= esUtils.addDoc("张三", "10", user);                     System.out.println(flag);                 }             }             client.close();         }catch (Exception e){             System.out.println(e);         }     } }